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Definition

duodenum noun

/ˌdjuː.əʊ ˈdiː.nəm/US pronunciation symbol/ˌduː.ə-/ n [C] (plural duodenums or duodena) specialized
the first part of the bowels just below the stomach

duodenal

adjective

/ˌdjuː.əʊ ˈdiː.nəl/US pronunciation symbol/ˌduː.ə-/ adj specialized
duodenal ulcers

(Definition of duodenum noun from the Cambridge Advanced Learner's Dictionary)
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